Saw table with vertically adjustable circular saw



SERAN `Iune 2Q E95@ R. E. DEGANCE sAw TABLE WITH VERTICALLY ADJUSTABLE CIRCULAR SAW Filed July 2s, 1948 JNVEN TOR.

YRalph B. Derq ance ATTORNEY Patented June 20, 1950 UNITED STATES SAW TABLE WITH VERTICALLY ADJUST- ABLE CIRCULAR SAW Ralph B. Dergance, Denver, Colo.

Application July 23, 1948,'Serial No. 40,390

4 Claims.

This invention relates to improvements in wood working machines and more particularly to a circular saw. y

In prior .art devices of this kind, due to the many and diiferent parts required for their production, an excessive number of tooling and machinery operations have been required which has necessarily rendered the cost thereof relatively high.

A primary object of the invention therefor, is to provide a` circular saw in which is'eliminated many difficult machining operations thereby reducing its cost.

Another object is to provide a saw which is constructed of a few duplicate parts.

Another object is to provide a saw which is light in weight, but yet has optimum rigidity.

Another object is to produce a saw which may be secured as an attachment to an ordinary at top work bench utilizing same as the saw table. v

I A further object is to provide a saw which may be constructed as a complete unit for attachment to any suitable support.

The above and other objects that may become apparent as the description proceeds are attained by means of `a construction and an arrangement of parts that will now be described in detail and for this purpose reference will be had to thel accompanying drawing in which the invention Figure 8 is a planview in reduced scale of a modified form of plate structure.k

Referring in detail to the drawing, there is shown in Figures 1 and 2 a saw lframe Il) comprising an upper plate II and a lower plate I2. one or the other of which is adapted to be secured to a suitable support and between which the operative parts of the saw are mounted. These plates are rectangular in shape and have a circular opening I3 at each of the four corners. These plates are secured together in spaced parallel relationship by tie bolts I4, nuts I5, I5 and spacer tubes I6.

Frame III is also provided with four vertical guide rods Il which have free ends extending into openings I8 in the top plate II. The lower end of guide rods I'I are secured to lower plate I2 by nuts I9 and between nuts I9 and plate I2 is interposed a plate .20, the purpose of which is hereafter set forth.

Upon guides I'I is mounted a sliding saw arborhead which comprises a plate 22 having at its corners guide tubes 23. These tubes extend through corner holes in plate 22 and are welded, brazed, or otherwise aixed thereto, as shown at 24. A saw :arbor tube 25 is attached to plate has been illustrated in its preferred form, and in f which: j

Figure l is a'side elevational view of the invention, partly inv section, taken on line II, Figure 2;

Figure 2 is an end elevational view'taken on line 2 2, Figure l; l'

Figure 3 is a sectional view taken on line 3 3, Figure 2;

Figure 4 is a side elevational view of the device in reduced scale shown attached to and depending from the lower side of a work table;

Figure 5 is a side elevational view of the device in reduced scale shown attached to the top of a table;

Figure 6 is a sectional -view of a modified supporting plate structure;

Figure 7 is a sectional view of an adjustment employed with the deviceshown in Figures l andl; and e 22 in a similar manner and is substantially the same length as plate 22 as shown in Figure 2. Saw arbor tube 25 is provided with suitable bearings either of the anti-friction or bushing type, which bearings support an :arbor or saw shaft 26 having a pulley 21 at one end and a saw 28 at the other end. The shaft is also provided with the conventional saw arbor flanges 29, 30, nut 3l and a collar 32 Afor adjusting the rend play in the :arbor shaft.

The saw arbor head 2| is adjusted vertically to vary the depth of cut of the saw by la linkage system 33. This system comprises eight identical links 34 pivoted together in separate spaced sets of four as shown at 35, 35, Figure 2. Each set has the ends of the links pivoted together to form a closed parallelogram linkage similar to a lazy tong. The upper ends ofthe pairs are d pivotally connected at the topto a tube 3l welded to the lower side of plate 22 and the lower ends of the pairs are similarly secured to a tube 38, secured to plate 20. Through tubes 31 and 33 extend suitable bolts or studs which pivotally secure the upper :and lower sets of links thereto.

Tubes 39 extend between the two sets of links at their lateral ends and are pivotally secured thereto by bolts or studs in the same manner as described for the upper and lower ends of the sets. The left tube 39 in Figure l carries a threaded lug 40 through which extends a threaded shaft 4| which is rotatably mounted in a similar, but unthreaded lug 42 secured to the right tube 39. Shaft 4I may be shouldered at 43 and a suitable collar 44 provided so that shaft 4I may rotate in lug 42, but will not have endwise movement. Shaft 4l is provided at one end with a crank 45 for rotating same and it will now become apparent that upon rotation thereof in a selected direction the arbor head 2| will be raised or lowered to adjust the depth of cut of the saw. By merely transposing the tubes 39 and thus the lugs 4D, 42, the crank45 may be disposed in a position most convenient to the operator, that is, either at the front or back of the saw frame.

In Figure 4 is shown one manner in which the saw are formed by one punch press operation.

In assembling the various parts of the arbor head 2l, or the plate 20 and its tube 38, the various parts are clamped in suitable iixtures to properly align them and such parts are then welded, brazed or otherwise secured together. The same procedure may also be employed for assembly of lugs 40 and 42 to their respective tubes 39. When the foregoing manner of construction is employed, the various parts may be made of steel or other inexpensive strong material .and optimum strength and rigidity achieved With .extreme lightness, Alternatively, if production costs dictate, certain of the various parts may be constructed as castings.

Having described the invention what is .claimed as new is:`

the subject of the invention may be used. The

saw frame I0 is shown mounted to the lower side of a conventional bench 46 .suitably secured thereto by the upper plate Hthrou'gh which extend wood screws or the like. The user may thus mount the saw frame to an existing work bench or may construct the bench of such size and configuration to conform .to his specialized requirements.

Figure 5 illustrates another manner oi use wherein the lower rather than the upper plate is :mounted to a bench or suitable stand and in this event the saw may `be constructed complete with ksaw table 41, or the saw may .be constructed as an lattachment and the user may construct the saw table 41 to meet his needs. When the saw is to be used as shown ,in Figure 5, suitable legs 48 ,may be incorporated therewith which are secured to lower plate I2 by nuts l5. This eliminates recessing the bench for nuts I5 which might otherwise occur.

Figure 6 shows a modification of top or bottom plate structure whereinsuch plates are formed with depressions 50 at their corners to receive nuts I5. This construction renders the outer surfaces of the top and bottom plates smooth and uninterrupted and eliminates the necessity of providing recesses in the bench or saw table for their reception.'

Figure '7 showsan adjusting device for moving the salw frame with respect `to a bench when the saw frame is ,mounted as in Figure 4 to thus provide for belt adjustment in event the driving motor or drive shaft may not be adjusted. This device comprises a lug 5l secured to plate Il, a second lug 52 which may be secured to the bench by an ear 53 and anadjusting screw 54 connecting the two lugs. When this adjustment is provided the upper plate il is mounted between parallel guide kplates 55 and straps 5B extend between these plates and beneath top Plate ll, the ends thereof and the straps being` secured `tothe underside of the bench by suitable screws. `4`or the vlike as shown in Figures l and ,2.

Figure 8 shows an alternativeconstruction for for the various vertical ytie .rods Vand guides.

With this construction, three different pieces of l. A circular saw machine of the class described comprising, a substantially rectangular iiat upper plate, a substantially identical lower 1 plate, vertical rods extending between said plates age system for each pair of guide lrods, each' linkage system being connected to the saw arbor and lower plate and `means for simultaneously operating both linkage systems to adjust ver# ticallythe saw arbor on ythe rguiderods 2. A circular saw machine comprising a sub-- stantially rectangular liiat upper plate, a sub' stantially identical lower plate, vertical rods extending between s aid plates at the corners thereof and securing said plates in spaced parallel relationship, two pairs of spaced' vertical guide rods extending between said plates, asaw arbor having guide means orengaging said guide rods, a .parallelogram linkage system for each pair of guide rods, each linkage system being connected at upper and lower opposite pivot points to the saw arbor and lower plate respectively` and tubes connecting the other opposite pivot points and extending between the two sets of links at their lateral-endsya threaded lug carried by one of the tubes and. an unthreaded lug carriedby the other tube, a 'rotatably mounted shaft extending through both lugs, a crank provided at one end of said shaft to rotate the same whereby both linkage systems are simultaneously operated to adjust the saw vertically on the guide rods.

3. A circular saw table-comprising a substantially rectangular fiat upper plate, a substantially identical lower plate, vertical rods extending between said plates at thecorners thereof and securing said plates in spacedparallel relationship,` tworpairs of spaced vertical guide rods extending between said plates, a saw arbor, guide means on said arbor and slidable -on said guide rods, a parallelogram linkage system for each pair of guide rods, eachlinkage system being connected at upper and lower opposite pivot points to the saw arbor and lower plate respectively, tubes connecting the other opposite pivot points and extending between the two sets of links at their lateral ends, a threaded lug carried by one of the tubes, and an unthreaded lug carried by the other tube, a revolvahly mounted threaded shaft extending through both lugs, a crank provided at one end of said shaft to rotate the same whereby both linkage systems are 5 simultaneously operated to adjust the saw arbor REFERENCES CITED vertically relative to the table. The f 110 I. f r n f 4. Acircular saw machine of the class described fue of is vgtgen e e ces are o record m the `comprising a at upper plate, a lower plate secured in spaced parallel relationship therewith, UNITED STATES PATENTS two pairs of spaced vertical guide rods extending Number Name Date between said plates, a, saw arbor having guide 141,975 Xander Aug. 19, 1873 means for engaging said guide rods, a parallelo- 881,064 Favreau Mar. 3, 1908 gram linkage system for each pair of guide rods, 1,387,869 Royle Aug. 16, 1921 each linkage system being connected to the saw 10 1,462,764 Nyquist et aL July 24, 1923 arbor and lower plate and means for simul- 1,825,104 Stacheli Sept. 29, 1931 taneously operating both linkage systems to ad- 1,901,915 Loughridge Mar. 2,1, 1933 just vertically the saw arbor on the guide rods. 2,323,248 Sellmeyer June 29, 1943 RALPH B. DERGANCE. 

